Quick Answer: What Is An Indicator Used For?

What are the three types of indicators?

There are three types of economic indicators: leading, lagging and coincident.

Leading indicators point to future changes in the economy.

They are extremely useful for short-term predictions of economic developments because they usually change before the economy changes..

What are the two types of indicators?

Type of indicatorsInput indicators. These indicators refer to the resources needed for the implementation of an activity or intervention. … Process and output indicators. Process indicators refer to indicators to measure whether planned activities took place. … Outcome indicators. … Impact indicators.

What is meant by indicator?

: a substance (as a dye) used to show visually (as by a change in color) the condition of a solution with respect to the presence of a particular material (as a free acid or alkali) litmus and phenolphthalein are acid-base indicators.

What is indicator and examples?

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

What is an indicator and how does it work?

pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is coloured and its conjugate base has a different colour, deprotonation causes a colour change.

What is an indicator and what can it tell us?

Indicators are measures – generally quantitative – that can be used to illustrate and communicate complex phenomena in a simple way, including trends and progress over time. Indicators can help tell if a problem is getting better or worse…

How do you define an indicator?

noun. something that provides an indication, esp of trendsSee economic indicator. a device to attract attention, such as the pointer of a gauge or a warning lamp. an instrument that displays certain operating conditions in a machine, such as a gauge showing temperature, speed, pressure, etc.

How does a universal indicator work?

A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. … Experiments with Yamada’s universal indicator are also described in the Journal of Chemical Education.

How do you know what indicator to use?

When selecting an indicator for acid-base titrations, choose an indicator whose pH range falls within the pH change of the reaction. For example, in the titration of a strong acid with a strong base, the pH quickly changes from 3 to 11.

What makes a good indicator?

An indicator should be defined in precise, unambiguous terms that describe clearly and exactly what is being measured. Where practical, the indicator should give a relatively good idea of the data required and the population among whom the indicator is measured.

What is an indicator in science?

Indicators are substances that change colour when they are added to acidic or alkaline solutions. Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.